[PATCH net] mlxsw: core: Use different get_trend() callbacks for different thermal zones

[Ido Schimmel]

From: Vadim Pasternak <vad...@mellanox.com>

The driver registers three different types of thermal zones: For the
ASIC itself, for port modules and for gearboxes.

Currently, all three types use the same get_trend() callback which does
not work correctly for the ASIC thermal zone. The callback assumes that
the device data is of type 'struct mlxsw_thermal_module', whereas for
the ASIC thermal zone 'struct mlxsw_thermal' is passed as device data.

Fix this by using one get_trend() callback for the ASIC thermal zone and
another for the other two types.

Fixes: 6f73862fabd9 ("mlxsw: core: Add the hottest thermal zone detection")
Signed-off-by: Vadim Pasternak <vad...@mellanox.com>
Reviewed-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/core_thermal.c    | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c 
b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index ce0a6837daa3..05f8d5a92862 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -391,8 +391,7 @@ static int mlxsw_thermal_set_trip_hyst(struct 
thermal_zone_device *tzdev,
 static int mlxsw_thermal_trend_get(struct thermal_zone_device *tzdev,
                                   int trip, enum thermal_trend *trend)
 {
-       struct mlxsw_thermal_module *tz = tzdev->devdata;
-       struct mlxsw_thermal *thermal = tz->parent;
+       struct mlxsw_thermal *thermal = tzdev->devdata;
 
        if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
                return -EINVAL;
@@ -593,6 +592,22 @@ mlxsw_thermal_module_trip_hyst_set(struct 
thermal_zone_device *tzdev, int trip,
        return 0;
 }
 
+static int mlxsw_thermal_module_trend_get(struct thermal_zone_device *tzdev,
+                                         int trip, enum thermal_trend *trend)
+{
+       struct mlxsw_thermal_module *tz = tzdev->devdata;
+       struct mlxsw_thermal *thermal = tz->parent;
+
+       if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
+               return -EINVAL;
+
+       if (tzdev == thermal->tz_highest_dev)
+               return 1;
+
+       *trend = THERMAL_TREND_STABLE;
+       return 0;
+}
+
 static struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
        .bind           = mlxsw_thermal_module_bind,
        .unbind         = mlxsw_thermal_module_unbind,
@@ -604,7 +619,7 @@ static struct thermal_zone_device_ops 
mlxsw_thermal_module_ops = {
        .set_trip_temp  = mlxsw_thermal_module_trip_temp_set,
        .get_trip_hyst  = mlxsw_thermal_module_trip_hyst_get,
        .set_trip_hyst  = mlxsw_thermal_module_trip_hyst_set,
-       .get_trend      = mlxsw_thermal_trend_get,
+       .get_trend      = mlxsw_thermal_module_trend_get,
 };
 
 static int mlxsw_thermal_gearbox_temp_get(struct thermal_zone_device *tzdev,
@@ -643,7 +658,7 @@ static struct thermal_zone_device_ops 
mlxsw_thermal_gearbox_ops = {
        .set_trip_temp  = mlxsw_thermal_module_trip_temp_set,
        .get_trip_hyst  = mlxsw_thermal_module_trip_hyst_get,
        .set_trip_hyst  = mlxsw_thermal_module_trip_hyst_set,
-       .get_trend      = mlxsw_thermal_trend_get,
+       .get_trend      = mlxsw_thermal_module_trend_get,
 };
 
 static int mlxsw_thermal_get_max_state(struct thermal_cooling_device *cdev,
-- 
2.26.2